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If you are sitting on a chair with the book open on the desk in front of you, very few

muscles are required to turn the page. First the arm is extended slightly to push the forearm and hand along the edge of the

book. Th is can be accomplished with the anterior portion of the deltoid muscle. The hand is then slightly supinated by means of the supinator muscle. Th e thumb and index finger are then fl exed to grasp the page to be turned. Th is movement involves the fl exor pollicis brevis and fl exor digitorum superfi cialis to the index fi nger (the flexor digitorum profundus may also be involved).

Th e page is then turned by extending the fingers (extensor digitorum), pronating the hand (pronator quadratus and pronator teres), and medially rotating the arm (pectoralis major, teres major, latissimus dorsi).

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If you are sitting on a chair with the book open on the desk in front of you, very few muscles are required to turn the page. First the arm is extended slightly to push the forearm and hand along the edge of the book. Th is can be accomplished with the anterior portion of the deltoid muscle. The hand is then slightly supinated by means of the supinator muscle. Th e thumb and index finger are then fl exed to grasp the page to be turned. Th is movement involves the fl exor pollicis brevis and fl exor digitorum superfi cialis to the index fi nger (the flexor digitorum profundus may also be involved). Th e page is then turned by extending the fingers (extensor digitorum), pronating the hand (pronator quadratus and pronator teres), and medially rotating the arm (pectoralis major, teres major, latissimus dorsi).


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